libdyld: handle existing but undefined symbols during lookup.

diff --git a/software/libdyld/dyld.c b/software/libdyld/dyld.c
index 112f2e04effd737a9fc8b9eb2181e4dc724dcbf5..da531b6d1ac21ee7e63840fe3561aefc44da1963 100644 (file)
--- a/software/libdyld/dyld.c
+++ b/software/libdyld/dyld.c
@@ -171,5 +171,9 @@ void *dyld_lookup(const char *symbol, struct dyld_info *info) {
         index = info->hash.chain[index];
     }
 
-    return (void*)(info->base + info->symtab[index].st_value);
+    Elf32_Addr value = info->symtab[index].st_value;
+    if(value != 0)
+        return (void*)(info->base + value);
+    else
+        return NULL;
 }